I believe this should work:
Add the following line under <Order> to the profile(s) you are running.
<TrinityCombatIgnore actorId="XXXX" name="XXXX" exceptElites="False" exceptTrash="False" />
You'll have to find the actorId and name using Trinity's dump options (may also possibly be in the log if it's trying to attack the demon). I can't get those for you as I don't have a Maximus.
This is just a work-around until Trinity can be updated.